1. Let's say it's somehow technically possible to bind huge ammounts of atmospheric CO2 back into the Earth's crust, this without pissing even more CO2 into the atmosphere, spending energy to bind it. Has anyone done the math as to how many tons of CO2 is necessary to bind, to get the atmospheric level down to, say, 300ppm, as with pre industrial age? How might that work, practically speaking?

2.

3. Originally Posted by CEngelbrecht
Let's say it's somehow technically possible to bind huge ammounts of atmospheric CO2 back into the Earth's crust, this without pissing even more CO2 into the atmosphere, spending energy to bind it. Has anyone done the math as to how many tons of CO2 is necessary to bind, to get the atmospheric level down to, say, 300ppm, as with pre industrial age? How might that work, practically speaking?
From a quick web search I find an estimate of 3 x 10¹² tonnes of CO2 in the atmosphere currently. As it is about 400ppm now, that would on the face of it mean sequestering around of 7.5 x 10¹¹ tonnes of CO2.

But unfortunately the real number is probably a lot higher than this, as the oceans absorb a large proportion of the emitted CO2, so that what we see in the atmospheric rise is that proportion that the oceans have not yet been able to absorb. If one were to bring the atmospheric CO2 down, I imagine the ocean would start to release dissolved CO2 again. So I can't work out the real number I'm afraid.

Interestingly about 90% of the CO2 at or near the Earth's surface seems to be in the oceans.

4. What exactly would be an efficient process to extract tons of CO2 from air? Can it be done exclusively with renewable electricity as a power source? And what "product" would come out of it, and can it just be dropped into deep pits around the world?

I know, I'm sounding like a five year old, but...

5. CO2 is an acidic gas, reacting it with a base would be the most efficient removal process. If a calcium based base were used the product would be calcium carbonate. The sheer amount of CO2 though makes this an unfeasible method for removing significant amounts.

6. Originally Posted by CEngelbrecht
What exactly would be an efficient process to extract tons of CO2 from air?
Use algae and sunlight to convert CO2 and water to biomass, then use high temperature processes to convert that to oil. Then store the oil.

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